Do you have a problem with neighbor cats using your gardens for a bathroom?  

I live in a complex where many people have cats. Some of those cats use my garden for a cat box and every time I go out to tend my garden, there are several more piles.
I finally came up with a solution! I put deer netting down and used stakes to keep it in place. I cut holes for the plants and when the cats go to scratch, their claws get stuck on the netting. Cats hate that so they go somewhere else. You can't see the netting but it sure upsets the cats.
I also was using beer in little containers for the slugs and I discovered that the beer was gone every morning. Now, I knew the slugs didn't drink it since it kills them. I discovered that a cat was coming and drinking all the beer every night. I had a true party animal on my hands! I had to go to a different method to kill the slugs.
I have tried red pepper, egg shells and other methods for detering the cats from pooping in my garden but so far the netting has worked the very best!